input: synaptics_fw_update: Parse the firmware_id only once
input: synaptics_fw_update: Parse the firmware_id only once

Firmware_id parsed two times. Remove the dead code and parse
the firmware_id only once.

Change-Id: I10c373332aab328c8ed6c2583194141f4182ac06
Signed-off-by: Sarada Prasanna Garnayak <84cfe16db89a2ebb03d6d198c33ca0e7be384572@codeaurora.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas